2 * drivers/extcon/extcon-adc-jack.c
4 * Analog Jack extcon driver with ADC-based detection capability.
6 * Copyright (C) 2012 Samsung Electronics
7 * MyungJoo Ham <myungjoo.ham@samsung.com>
9 * Modified for calling to IIO to get adc by <anish.singh@samsung.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
17 #include <linux/module.h>
18 #include <linux/slab.h>
19 #include <linux/device.h>
20 #include <linux/platform_device.h>
21 #include <linux/err.h>
22 #include <linux/interrupt.h>
23 #include <linux/workqueue.h>
24 #include <linux/iio/consumer.h>
25 #include <linux/extcon/extcon-adc-jack.h>
26 #include <linux/extcon.h>
29 * struct adc_jack_data - internal data for adc_jack device driver
30 * @edev: extcon device.
31 * @cable_names: list of supported cables.
32 * @adc_conditions: list of adc value conditions.
33 * @num_conditions: size of adc_conditions.
34 * @irq: irq number of attach/detach event (0 if not exist).
35 * @handling_delay: interrupt handler will schedule extcon event
36 * handling at handling_delay jiffies.
37 * @handler: extcon event handler called by interrupt handler.
38 * @chan: iio channel being queried.
40 struct adc_jack_data {
41 struct extcon_dev *edev;
43 const unsigned int **cable_names;
44 struct adc_jack_cond *adc_conditions;
48 unsigned long handling_delay; /* in jiffies */
49 struct delayed_work handler;
51 struct iio_channel *chan;
54 static void adc_jack_handler(struct work_struct *work)
56 struct adc_jack_data *data = container_of(to_delayed_work(work),
63 ret = iio_read_channel_raw(data->chan, &adc_val);
65 dev_err(&data->edev->dev, "read channel() error: %d\n", ret);
69 /* Get state from adc value with adc_conditions */
70 for (i = 0; i < data->num_conditions; i++) {
71 struct adc_jack_cond *def = &data->adc_conditions[i];
74 if (def->min_adc <= adc_val && def->max_adc >= adc_val) {
79 /* if no def has met, it means state = 0 (no cables attached) */
81 extcon_set_state(data->edev, state);
84 static irqreturn_t adc_jack_irq_thread(int irq, void *_data)
86 struct adc_jack_data *data = _data;
88 queue_delayed_work(system_power_efficient_wq,
89 &data->handler, data->handling_delay);
93 static int adc_jack_probe(struct platform_device *pdev)
95 struct adc_jack_data *data;
96 struct adc_jack_pdata *pdata = dev_get_platdata(&pdev->dev);
99 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
103 if (!pdata->cable_names) {
104 dev_err(&pdev->dev, "error: cable_names not defined.\n");
108 data->edev = devm_extcon_dev_allocate(&pdev->dev, pdata->cable_names);
109 if (IS_ERR(data->edev)) {
110 dev_err(&pdev->dev, "failed to allocate extcon device\n");
114 if (!pdata->adc_conditions ||
115 !pdata->adc_conditions[0].state) {
116 dev_err(&pdev->dev, "error: adc_conditions not defined.\n");
119 data->adc_conditions = pdata->adc_conditions;
121 /* Check the length of array and set num_conditions */
122 for (i = 0; data->adc_conditions[i].state; i++)
124 data->num_conditions = i;
126 data->chan = iio_channel_get(&pdev->dev, pdata->consumer_channel);
127 if (IS_ERR(data->chan))
128 return PTR_ERR(data->chan);
130 data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms);
132 INIT_DEFERRABLE_WORK(&data->handler, adc_jack_handler);
134 platform_set_drvdata(pdev, data);
136 err = devm_extcon_dev_register(&pdev->dev, data->edev);
140 data->irq = platform_get_irq(pdev, 0);
142 dev_err(&pdev->dev, "platform_get_irq failed\n");
146 err = request_any_context_irq(data->irq, adc_jack_irq_thread,
147 pdata->irq_flags, pdata->name, data);
150 dev_err(&pdev->dev, "error: irq %d\n", data->irq);
157 static int adc_jack_remove(struct platform_device *pdev)
159 struct adc_jack_data *data = platform_get_drvdata(pdev);
161 free_irq(data->irq, data);
162 cancel_work_sync(&data->handler.work);
163 iio_channel_release(data->chan);
168 static struct platform_driver adc_jack_driver = {
169 .probe = adc_jack_probe,
170 .remove = adc_jack_remove,
176 module_platform_driver(adc_jack_driver);
178 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
179 MODULE_DESCRIPTION("ADC Jack extcon driver");
180 MODULE_LICENSE("GPL v2");